1 month later. How to get over him and see him occasionally?

Hey how is everyone doing? I just want to write it off my shoulders…a month ago I made a post on here about sex with a coworker. I feel like the month has passed by so quickly but at the same time so slowly. Still getting used to us not talking. It’s been hard to focus at work, been thinking of all the explanations that I didn’t and maybe never will get. I am trying so hard to let it go and I thought that I felt a little bit better until I saw him at the office yesterday, after not seeing him for like a month or so. And it hit me so damn hard. Honestly, I just wanted to cry . How can I get over someone that I have to face once in a while? And at the same time I just long for answers and some kind of good conversation.. and I know I cannot force him. I just miss him and the bond we had and It just hurts that he acts like im not even there. The urge to talk to him is so big but at the same time I do not want to do it at work. Just wanted to write my thoughts down and have some relief..